On the density regime probed by HCN emission

Gerwyn H. Jones, Paul C. Clark, Simon C. O. Glover +1

HCN J$=$1$-$0 emission is commonly used as a dense gas tracer, thought to mainly arise from gas with densities $\sim 10^4-10^5\mathrm{c}{\mathrm{m}}^{-3}$. This has made it a…